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Tuberculin Skin Test and Interferon-γ Release Assays in the Diagnosis of Ocular Tuberculosis

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Book cover Ocular Tuberculosis

Part of the book series: Essentials in Ophthalmology ((ESSENTIALS))

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Abstract

The diagnosis of ocular tuberculosis (TB) is complex as it can manifest as almost any type of extra- or intraocular inflammation. It commonly presents as tuberculous uveitis, a paucibacillary disease in which investigations required for the definitive diagnosis such as mycobacterial cultures and acid-fast bacilli smears are of low sensitivity. The diagnosis of “presumed” tuberculous uveitis is often made in patients with the at-risk epidemiological background and suggestive clinical features in the presence of a positive tuberculin skin test (TST), positive interferon-γ release assay (IGRA), radiological evidence of pulmonary TB, and/or evidence of associated extrapulmonary TB infections in the absence of any other underlying disease. Due to the nonspecific nature of the mycobacterial antigens, the TST may have false-positive responses in individuals infected with nontuberculous mycobacterium or vaccinated with bacillus Calmette–Guérin. The IGRAs provide greater specificity for M. tuberculosis. However, both the TST and IGRAs cannot distinguish between latent TB infection, active TB, and previous TB and may be less useful in pediatric and elderly patients. IGRAs should not be used as a screening test or first-line investigation in tuberculous uveitis but are a useful adjunct for diagnosis. There is currently no clear consensus on the appropriate clinical approach, choice of investigation(s), or the most cost-effective testing algorithm. The choice of first-line investigation depends on endemicity of TB and cost-effectiveness.

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Chan, N.SW., Chee, SP. (2017). Tuberculin Skin Test and Interferon-γ Release Assays in the Diagnosis of Ocular Tuberculosis. In: Kumar, A., Chawla, R., Sharma, N. (eds) Ocular Tuberculosis. Essentials in Ophthalmology. Springer, Cham. https://doi.org/10.1007/978-3-319-57520-9_5

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